US11050104B2 - Battery pack and automobile comprising same - Google Patents

Battery pack and automobile comprising same Download PDF

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Publication number
US11050104B2
US11050104B2 US16/481,266 US201816481266A US11050104B2 US 11050104 B2 US11050104 B2 US 11050104B2 US 201816481266 A US201816481266 A US 201816481266A US 11050104 B2 US11050104 B2 US 11050104B2
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United States
Prior art keywords
case body
case
weld quality
battery pack
quality indicator
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Active, expires
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US16/481,266
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English (en)
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US20200044204A1 (en
Inventor
Gyo-Eun LEE
Seong-tae Kim
Eui-Hoon MYUNG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Energy Solution Ltd
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LG Chem Ltd
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Publication date
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Assigned to LG CHEM, LTD. reassignment LG CHEM, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, SEONG-TAE, LEE, Gyo-Eun, MYUNG, Eui-Hoon
Publication of US20200044204A1 publication Critical patent/US20200044204A1/en
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Assigned to LG ENERGY SOLUTION, LTD. reassignment LG ENERGY SOLUTION, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LG CHEM, LTD.
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • B23K31/125—Weld quality monitoring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to a battery pack, and a vehicle including the battery pack.
  • Secondary batteries which are highly applicable to various products and exhibit superior electrical properties such as high energy density, and the like are commonly used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electrical power sources.
  • EVs electric vehicles
  • HEVs hybrid electric vehicles
  • the secondary battery is drawing attentions as a new energy source not only due to a primary advantage that the use of fossil fuels may be significantly reduced, but also due to improved environment friendliness and energy efficiencies, and due to no byproduct generated during the energy consumption.
  • Secondary batteries widely used at present include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries and the like.
  • An operating voltage of the unit secondary battery cell namely a unit battery cell, is about 2.5 V to 4.6 V. Therefore, if a higher output voltage is required, a plurality of battery cells may be connected in series to configure a battery pack. In addition, depending on the charge/discharge capacity required for the battery pack, a plurality of battery cells may be connected in parallel to configure a battery pack.
  • the number of battery cells included in the battery pack may be variously set based on the required output voltage or the demanded charge/discharge capacity.
  • the battery cells configuring the battery module or the battery pack are generally pouch-type secondary batteries that may be easily stacked on one another.
  • a conventional battery pack includes a battery module having at least one battery cell, and a pack case for packaging the battery module.
  • the pack case includes a case body for accommodating the battery module, and a case cover welded to the case body to package the battery module.
  • the weld quality for the welding work is related to the seal of the pack case, and thus, inspecting the weld quality between the case body and the case cover is an important factor in the welding process.
  • the weld quality is inspected from the melting height of the welding surface between the case body and the case cover.
  • the height may be checked using a separate sensor or other equipment.
  • the present disclosure is directed to providing a battery pack, which may more easily check the weld quality of a pack case during a welding process, and a vehicle including the battery pack.
  • the present disclosure is also directed to providing a battery pack, which may quantitatively determine the weld quality of a pack case during a welding process, and a vehicle including the battery pack.
  • a battery pack comprising: a battery module having at least one battery cell; a pack case having a case body for accommodating the battery module and a case cover configured to be welded to the case body to package the battery module; and at least one weld quality indicator provided on the case body of the pack case to inspect accuracy of the welding.
  • the case cover may be coupled to an upper rim of the case body by welding, and the at least one weld quality indicator may be formed at the upper rim of the case body.
  • At least one of height and slope of the case cover may be changed along a lower side of the case body by the welding, and the at least one weld quality indicator may allow the changed height and/or slope of the case cover to be inspected by a vision of a user.
  • the at least one weld quality indicator may include a plurality of engraved dimensional marks formed with a predetermined length along a horizontal direction of the case body.
  • the plurality of engraved dimensional marks may be disposed to be spaced apart from each other by a predetermined distance along a vertical direction of the case body.
  • the plurality of engraved dimensional marks may be formed to have at least two different lengths.
  • the engraved dimensional marks having different lengths may be arranged alternately.
  • the plurality of engraved dimensional marks may be provided as inscribed grooves formed with a predetermined depth at the case body.
  • the weld quality indicator may be provided in plural, and the plurality of weld quality indicators may be disposed to be spaced apart from each other by a predetermined distance along the upper rim of the case body.
  • a vehicle comprising at least one battery pack according to the above embodiments.
  • a battery pack which may allow easier inspection of the weld quality of a pack case during a welding process, and a vehicle including the battery pack.
  • a battery pack which may quantitatively determine the weld quality of a pack case during a welding process, and a vehicle including the battery pack.
  • FIG. 1 is a diagram for illustrating a battery pack according to an embodiment of the present disclosure.
  • FIG. 2 is a perspective view showing a case body of a pack case, employed in the battery pack of FIG. 1 .
  • FIG. 3 is a side view showing the case body of FIG. 2 .
  • FIG. 4 is an enlarged view showing a portion A of the case body of FIG. 3 .
  • FIG. 5 is a diagram for illustrating a welding work for the pack case, employed at the battery pack of FIG. 1 .
  • FIGS. 6 to 8 are diagrams for illustrating a process of checking welding quality using a weld quality indicator during the welding work of FIG. 5 .
  • FIG. 1 is a diagram for illustrating a battery pack according to an embodiment of the present disclosure
  • FIG. 2 is a perspective view showing a case body of a pack case, employed in the battery pack of FIG. 1
  • FIG. 3 is a side view showing the case body of FIG. 2
  • FIG. 4 is an enlarged view showing a portion A of the case body of FIG. 3 .
  • a battery pack 10 may be provided as an energy source for an electric vehicle, a hybrid vehicle, or the like. However, the present disclosure is not limited thereto, and the battery pack 10 may also be provided as a domestic or industrial energy source.
  • the battery pack 10 may include a battery module 100 , a pack case 200 , and a weld quality indicator 300 .
  • the battery module 100 may include at least one battery cell or a plurality of battery cells.
  • the battery cell is a secondary battery and may be provided as a pouch-type secondary battery.
  • the present disclosure is not limited thereto, and the battery cell may also be a cylindrical or rectangular secondary battery.
  • the pack case 200 is for packaging the battery module 100 and may include a case body 210 and a case cover 230 .
  • the case body 210 may have an accommodation space for accommodating the battery module 100 .
  • the case body 210 may be welded to a case cover 230 , to be explained later, to package the battery module 100 .
  • the welding may be performed at an upper side of the case body 210 , specifically at an upper rim 215 of the case body 210 .
  • the inside of the pack case 200 may be sealed.
  • the case cover 230 covers the upper side of the case body 210 and may be connected to the case body 210 by means of the welding to package the battery module 100 together with the case body 210 . Specifically, the case cover 230 may be welded to the upper rim 215 of the case body 210 .
  • the weld quality indicator 300 is for inspecting the accuracy of the welding, such as the quality of the welding, and may be provided on the case body 210 of the pack case 200 . Specifically, the weld quality indicator 300 may be formed at the upper rim 215 of the case body 210 .
  • the weld quality indicator 300 may indicate the accuracy of welding such as the weld quality through a visual inspection by a user. Specifically, when the case body 210 and the case cover 230 are welded, a height and/or slope of the case cover 230 is changed as a weld portion of the case body 210 is melted down, and the weld quality indicator 300 may allow the changed height and/or slope of the case cover 230 to be detected by the vision of the user.
  • the weld quality indicator 300 may be provided in plural, and the plurality of weld quality indicators 300 may be disposed to be spaced apart from each other by a predetermined distance along the upper rim 215 of the case body 210 .
  • the plurality of weld quality indicator 300 may include a plurality of engraved dimensional marks 310 , 330 , respectively.
  • the plurality of engraved dimensional marks 310 , 330 may have a predetermined length along a horizontal direction of the case body 210 and may be spaced apart from each other by a predetermined distance along a vertical direction of the case body 210 .
  • the plurality of engraved dimensional marks 310 , 330 may be provided as dimensional inscribed grooves formed with a predetermined depth from the case body 210 .
  • the present disclosure is not limited thereto, and it is also possible that the plurality of engraved dimensional marks 310 , 330 have a protruding shape that may be easily inspected by the vision of the user.
  • the plurality of engraved dimensional marks 310 , 330 may be formed at positions where the entire width W of the plurality of engraved dimensional marks 310 , 330 along the vertical direction of the case body 210 may serve as an indicator for assuring the accuracy of the welding during the welding process. Accordingly, in the event that the bottom portion of the case cover 230 that is lowered by the welding is disposed within the entire width of the plurality of engraved dimensional marks 310 , 330 along the vertical direction during the welding process, the user may determine that the welding has been performed to ensure the sealability.
  • the plurality of engraved dimensional marks 310 , 330 may be formed to have at least two different lengths in the horizontal direction of the case body 210 . Moreover, the engraved dimensional marks 310 , 330 having different lengths may be alternately arranged in the vertical direction of the case body 210 . This is to further increase the visibility to the user when the plurality of dimensioned carved portions 310 , 330 are inspected by the vision of the user.
  • FIG. 5 is a diagram for illustrating a welding work for the pack case, employed in the battery pack of FIG. 1
  • FIGS. 6 to 8 are diagrams for illustrating a process of checking the weld quality using a weld quality indicator during the welding work of FIG. 5 .
  • the case body 210 and the case cover 230 of the pack case 200 are welded, at least one of height and slope of the case cover 230 may be changed to be lowered toward a lower side of the case body 210 as the welding is performed.
  • the user such as a worker may more conveniently inspect the changed position of the case cover 230 via the weld quality indicator 300 .
  • the accuracy of the weld quality may be more conveniently checked by visually inspecting the changed position of the case cover 230 using the weld quality indicator 300 .
  • the user such as a worker may check that the welding is performed properly if the lowered height h of the case cover 230 is disposed within the full width W (see FIG. 4 ) of the weld quality indicator 300 and the case cover 230 is parallel to the horizontal length of the engraved dimensional marks 310 , 330 of the weld quality indicator 300 .
  • the welding is determined to be defective in the following cases. As shown in FIG. 7 , if the lowered height hl of the case cover 230 is disposed above the uppermost end of the engraved dimensional marks 310 , 330 of the weld quality indicator 300 , the user may inspect this by vision and determine that the welding is defective.
  • the user may inspect this by the vision and determine that the welding is defective.
  • the accuracy of the welding of the pack case 200 may be inspected merely by the vision of the user such as a worker via the weld quality indicator 300 .
  • the accuracy of the welding may be clearly determined by inspecting whether the lower end of the case cover 230 is disposed within the width range in the vertical direction of the weld quality indicator 300 and also by inspecting the slope of the lower end of the case cover 230 with respect to the weld quality indicator 300 .
  • the weld quality of the pack case 200 may be immediately inspected by the vision of the user such as a worker during the welding process by means of the weld quality indicator 300 provided on the case body 210 of the pack case 200 , there is no need for a post inspection process using equipment such as a separate sensor for checking the weld quality.
  • the cost and additional overall process time caused by the addition of a separate weld inspection facility may be significantly reduced.
  • a battery pack 10 which may more easily inspect the weld quality of the pack case 200 during a welding process, and a vehicle including the battery pack.
  • a battery pack 10 which may quantitatively determine the weld quality of the pack case 200 during a welding process, and a vehicle including the battery pack.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Quality & Reliability (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
US16/481,266 2017-08-22 2018-07-23 Battery pack and automobile comprising same Active 2038-11-21 US11050104B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2017-0106049 2017-08-22
KR1020170106049A KR102175940B1 (ko) 2017-08-22 2017-08-22 배터리 팩 및 이를 포함하는 자동차
PCT/KR2018/008293 WO2019039744A1 (ko) 2017-08-22 2018-07-23 배터리 팩 및 이를 포함하는 자동차

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US20200044204A1 US20200044204A1 (en) 2020-02-06
US11050104B2 true US11050104B2 (en) 2021-06-29

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US16/481,266 Active 2038-11-21 US11050104B2 (en) 2017-08-22 2018-07-23 Battery pack and automobile comprising same

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US (1) US11050104B2 (ko)
EP (1) EP3573132B1 (ko)
JP (1) JP7038948B2 (ko)
KR (1) KR102175940B1 (ko)
CN (1) CN110199408B (ko)
ES (1) ES2950683T3 (ko)
HU (1) HUE062444T2 (ko)
PL (1) PL3573132T3 (ko)
WO (1) WO2019039744A1 (ko)

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USD911933S1 (en) * 2020-07-10 2021-03-02 Inventus Power, Inc. Battery
USD910546S1 (en) * 2020-07-10 2021-02-16 Inventus Power, Inc. Battery
USD910547S1 (en) 2020-07-21 2021-02-16 Inventus Power, Inc. Battery
USD971827S1 (en) * 2020-07-30 2022-12-06 Dragonfly Energy Corp. Battery pack
JP2024143487A (ja) * 2023-03-30 2024-10-11 株式会社Ａｅｓｃジャパン 電池モジュール、電池モジュールの製造方法及びレーザ溶接の検査方法

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KR20190021008A (ko) 2019-03-05
CN110199408A (zh) 2019-09-03
KR102175940B1 (ko) 2020-11-06
CN110199408B (zh) 2023-05-12
US20200044204A1 (en) 2020-02-06
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